Get Next Date

// <summary>
/// Finds the next date whose day of the week equals the specified day of the week.
/// </summary>
/// <param name="startDate">
///		The date to begin the search.
/// </param>
/// <param name="desiredDay">
///		The desired day of the week whose date will be returneed.
/// </param>
/// <returns>
///		The returned date is on the given day of this week.
///		If the given day is before given date, the date for the
///		following week's desired day is returned.
/// </returns>
public static DateTime GetNextDateForDay( DateTime startDate, DayOfWeek desiredDay )
{
    // (There has to be a better way to do this, perhaps mathematically.)
    // Traverse this week
    DateTime nextDate = startDate;
    while( nextDate.DayOfWeek != desiredDay )
        nextDate = nextDate.AddDays( 1D );
 
    return nextDate;
}